Screw-machine



(N0 Model.) 7jSheets--Sheet 3.

F. SGHULZE.

SGRBW MACHINE.

Patented Mar. 16, 1897.

l Ewenta/U.

(No Model.) v P' SGHULZB 7 Sheets-Sheet 4 SCREW MACHINE.

Patented Mar. 16,1897

fra/25225.

m: mams Varens co. Funnmnua. wAsmusmN n nl v(No Model.) 7- Sheets-Sheet 6.

P@ SGHULZB.` SCREW MACHINE.

(No Model.) I 7 sheetssheet P. SGHULZE. 4

SCREW MACHINE.

No. 578,7 77. Patented Mar. 16,1897.

A il V V@ PATENT OEETCE.

FREDERICK SOIIULZE, OF CLEVELAND, OHIO.

SCREW-MACHINE.

SPECIFICATION forming part of Letters Patent NO. 578,777, dated March 16, 1897.

Application filed November 16, 1896. Serial No. 612,353. (No model.) I

To all whom, t muy concern:

Be it known that I, FREDERICK SCHULZE, a citizen of the United States, residing at Cleveland, in the county 0f Ouyahoga and State of Ohio, have invented certain new and useful Improvements in Screw-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the'art to which it appertains to make and use the same.

It Will be understood that the machine shown, although called a screW-machine, may be used to make many other articles besides screws.

The machine is a turret-lathe containing many novel features of construction, which result in the automatic action, in proper sequence, of the turret-slide backward and forward at different rates of speed, in the sev eral movements of the turret itself to bring the diierent tools carried thereby into action, in proper feed movement of the Work, in the rotation of the live-spindle in both directions at the same or different rates of speed, and in the m ovem ent of the carriage carrying the c utting-offtool. Themaehinealso containsother novel features of construction, which, together with the construction producing the results above mentioned, will be hereinafter described, and the various combinations of parts constituting the invention Will be defi'- nitely pointed out in the claims.

In the drawings, Figure l is a front elevation of the machine. Fig. 2 is a rear elevation. Fig. 3 is a plan View., Fig. 4 is a sec tionalview on line 4 4c of Fig. 3. Fig. 5 is an enlarged front View, partly broken away, of the ratchet-clutch constituting part of the silent feed. Fig. 6 is a side View of the middle disk shown in Fig. 5. Fig. 7 is a transverse sectional vieivof the ratchet-clutch associated with the starting-handle.4v Fig.` S is a sectional front elevation in the plane indicated by line S 8 of Fig. l1. Fig. 9 is a sec-- tional front elevation on the same plane of the right-hand end of the machine. Figs. 8 and 9 together constitute one complete sectional elevation of the machine. Fig. 10 is a lefthand elevation. Fig. 11 is a right-end elevation when wed ge J is in engagement with disk, the upper part being sectioned on line 1l 11 of Fig. 1. Fig. 12 is a sectional right-end elevation on line 12 12 of Fig. 2, showing the mechanism for turning the turret-spindle. Fig. 13 is a sectional front View of the righthand end of themachine on line 13 13 of Fig. 11. Fig. let is a vertical transverse section showing the mechanism for moving the toolslide. l Fig. 15 is a detached rear View, partly broken away, of the bell-crank lever which forms a part of said tool-slide-operating mechanism. Fig. 16 is a sectional View on line 16 16 of Fig. 9.

Referring to the parts by letter, A repre sents the framework of the machine, whereon the various moving parts are supported in the manner presently to be described. B represents the tubular live-spindle. O represents the chuck-sleeve, and D represents the feeding-tube. All of these parts are of a Wellknovvn construction, and they are arranged and supported, the one within the other, in the usual manner.

E represents the main driving-shaft of the machine, which is driven'by means to be presently described. 2

The various parts of the machine, excepting only the live-spindle, receive their motion, through suitable mechanism, from the main shaft, and this mechanism is so constructed and connected with the main driving-shaft that one revolution of said shaft causes a complete cycle of all the movements of the other parts.

Supported upon the live-spindle are three pulleys, of which the pulley b is keyed to the spindle, the pulley b' is loose upon the spindle, and the pulley b2 is keyed to a sleeve b3, which is loose on the spindle. A belt (which is not shown) is moved from one of these pulleys to the other by means of a belt-shipper lever b4, which is pivoted to a fixed bracket a. The lower end of this belt-shipper lever is V-shaped, or, in other words, it has the camsurfaces b5 h6 on opposite sides of its said end. Adj ustably secured upon the main shaft are tivo arms e5 c6, which are adapted to engage, 1espectively,with the said cam-surfaces as the shaft revolves and thereby rock lthe lever and ship the belt from the pulley b to the pulley b2 and back again during each complete revolution of the main shaft. When the belt is running on the pulley b2, the spindle is revolved in the direction for cutting the stock through a train of gears, .which reduces the speed of the spindle. This train of gears con- IOO y the framework ct.

sists of the gear 57, which is formed on the end of the sleeve hs, and a gear f,`which meshes with the gear 57 and is itself fast upon a short rotatable shaft f, which shaft has also fast upon it a gear f2. This shaft fis journaled in a rocker-arm F, which is hung loosely upon the spindle B and extends to both sides thereof. In the ends of this arm are the curved slots f3f4, which are concentric with the spindle, and the bolts f5 pass through these slots respectively and engage with a-iixed part a' `of the frame. The gear f2 meshes with an idler-gear f6, which is mounted on a stud f7, which is secured to the inner face of the part ct ofthe frame. This idler-gear meshes with a gear bs, which is keyed to the spindle. The motion of the pulley b2 is transmitted through these gears 197, f', f2, f6, and hs to the shaft, revolving it in the reverse direction to that in which it revolves when the belt is running on pulley b, and at a much lower rate of speed. When the belt is running on the pulley h, this pulley and the live-spindle are being revolved in the reverse direction at the same rate of speed as the belt is moving. The rate of revolution of the spindle when revolving in the reverse direction relative to the speed vwhen revolving in the cutting direction may be changed by rst removing the gear f2 and substituting a larger or smaller gear therefor and by adjusting the rocker-arm F around the spindle until the said gear meshes properly With the vidler-gear f6.

The chuck-sleeve C is moved back and forth in the spindle to grasp and release the work by means of the levers c, which are pivoted to a collar c', fast on the spindle; and these levers are operated by a cone c2, which is movable longitudinally on the spindle, these parts being substantially the same as the mechanism heretofore in commonuse for the purpose of operating similar chucks. This cone is moved back and forth by means of fork-arms c3, secured upon a sleeve c1, which is longitudinally movable upon a stud a2, secured to A pin c5, which is secured to this sleeve, enters a cam-groove c6 in the segment-shaped face of the work-arm c7 of a three-armed lever, which is loosely pivoted on a stud a3. The two power-arms o8 ci of this lever lie on opposite sides of the main shaft E at points where the friction-rollers 010 C11, mounted in the ends of the lever-arms c8 a9, will be struck, respectively, by the cam-plates e e2, which are adjustably secured to opposite faces of the disk "e3, which is secured to said main shaft.

The feed-tube D is moved forward for the purpose of feeding the stock, and backward to its original place in readiness for another feed movement, by means of a grooved collar d, secured to the end of the feed-tube, a fork-lever CZ', pivoted to the end of the stud a3, and the cam-plates cl2, which are secured to the face of the drum d4, which is in turn secured to the main shaft E.

Gr represents the turret which is secured to the end of the spindle Q. This spindle is mounted in the turret-slide Q', which slide is mounted in guides in a cradle Q2, which is secured upon the bed-plate of the machine in the usual manner. The tail end of the turret-spindle is slidable through the sleeve Q1, which is mounted in a fixed standard d1. In the face of the turret there may be as many sockets Q5 for holding tools as desired, and the machine will be organized so that the complete revolution of the turret will be effected by as many independent movements as there are sockets. In the present case four of these sockets are formed in the turret. Then the tu rret-slide is drawn back, the turret is turned to bring the tools carried in these sockets into position to act upon the stock by the following mechanism Secured to the turret-'spindle is a ratchet-wheel Q6, which may have any suitable construction. Adjacent to it is a disk Q7, which is fast on a sleeve Q1. On the 'extreme end of this sleeve is a disk QS, hav-` i-ng a crank-pin (9, upon which is pivoted the upper end of a bent connecting-rod Q10, the lower end of which is pivoted to a lever Q11. This lever is pivoted toa fixed part of the framework, and it is normally drawn down by the spring Q12 into contact with the face of the disk H, which is secured to the main shaft E. Adjustable cam-blocks h, corresponding in number to the number of sockets in the turret, (in the present case four,) are secured to this disk, and they are adapted to severally engage with a friction-roller Q13 on the lever, thereby rocking the lever upward upon its pivot, with the result of rotating the sleeve g4 one-quarter of a revolution. This movement is transmitted to the ratchet-wheel QG by means of a pawl Q14, which is carried by the disk Q7. In the particular construction of these parts shown the pawl Q11 is pivoted in a socket in disk Q7. The pawl maysxving entirely into this socket or it may project at right angles therefrom, as shown in the drawings. The teeth of the ratchet-wheel Q" are four pins Q15, which project horizontally toward the disk Q7 and into position to be engaged by said pawl Q11. When the disk Q7 is being revolved in one direction, the pawl engaging with one of said pins is forced back into the socket in disk Q7. l When it has passed said pin, it falls out behind said pins Q15, and when the disk Q7 moves in the reverse direction the pawl engages with said pin and moves the ratchet QG with it.

The turret-slide is moved toward and from the work by mechanism to be presently eX- plained. Novel means are provided, however, for locking the turret in its different working positions. The turret is locked by means of a disk Q16, having in its edge as many radial tapered slots Q17 as there are tool-sockets in the turret. A fixed but adjustable wedge-block J is adapted to enter one of' these slots when the turret is moved forward, that is, toward the work. This wedge-block is tapered so as to fit `the tapered TIO slots. Its lower surface is inclined and rests upon the oppositely-inclined top of a block j.

A bolt j 3, which passes through the bed-plate of the machine and through a slot in this block 5 j, screws into the wedge-block J and holds these parts down upon each other and upon the bed-plate. The position of the block j is adj usted by means of two screw-bolts, one of which (indicated by 7") screws through a iiXed bracket n.6 against the end of the block j, while the other L7'2 passes loosely through said bracket and screws into said block j. By the movement of this block j the position of the wedge-block J may be accurately adjusted, so that it will tightly fit the slot-s in the disk gw, and thereby hold the turret absolutely immovable as to motion upon its axis. Vhen the turret-slide has been moved back far enough, the said disk Q16 is disconnected from the wedge-block J and the turret may be turned; but soon after the turret-slide begins its forward movement the described engagement of the wedge-block in said slots in said disk takes place. It is believed that this is a far more effective mechanism for holding the turret iirmly in position while the cutting is going on than any of the mechanisms heretofore employed for this purpose.

The forward and backward movements of the turret-slide are accomplished by the following mechanism: A stud g1g, which screws into the turret-slide, passes through slots in the cradle and the bed-plate, and it is provided with a collar1 y19, which bears against the under side of the bed-plate. A roller Q20 on the lower end of this stud enters a circumferential groove'k' in a drum 7c, which is loosely mounted on the supplemental shaft K, which is parallel with the main driving-shaft E. This drum is caused to revolve with the shaft, but is permitted to move longitudinally thereon by means of a disk k2, which is keyed to the shaft, and the pins k3, which are driven into this disk and pass looselythron gh holes in the hub of the/drum 7c. This drum is moved longitudinally upon the shaft K, thereby effecting the forward and backward movements of the turret-slide by the following mechanism: The sliding rod M is mounted in fixed brackets d8 a, and it is parallel with the main driving-shaft. Proj ectinglaterally from it is a pin m5, which pin is adapted to be engaged by two cam-plates le* h5, which are secured upon the face of the drum 7c. These cam-plates have their spiral edges, which engage with a roller m5 on this pin, laid in opposite direct-ions, wherefore it is clear that if the rod is prevented from moving longitudinally the engagement of these spiral cams with said roller will ca use the drum to slide longitudinally upon the shaft K. The longitudinal movement of this rod M is limited,iirst, by the engagement of a iiXed collar m with the fixed bracket a9, in which the rod slides. Its

movement in the other direction is limited by the engagement of a friction-roller m3, mounted upon a pin m2, which projects laterally from varied for every tool in the turret.

the rod, with the dogs n, which are adj ustably secured upon the face of the drum N, which is secured to the main driving-shaft E. By means of these adjustable dogs 'n the length of the movement of the turret-slide may be For eX- ample, to shorten the length of any movement of the turret-slide one of these dogs n may be moved on the face of the drum N toward the turret end of the machine. This permits the rod to slide in its bearings a short distance in either direction, but only until either the collar m engages the fixed bearing a9 or the roller m3 engages the face of the said dog n. These dogs n are each slotted and are secured upon the face of the drum by screws ln. Their position is adjusted by means of the screws n2, which screw through the flange n3 on drum N. During this longitudinal movement of the rod the turret-slide remains stationary. It is only when the movement of this rod M in one direction or the other is checked that the turretslide is caused to move. In the rotation of the drum one of the cams 7a4 or h5, as the case may be, strikes the roller m5 and first moves the rod until the collar m strikes the framework of the machine, or until the roller m3 strikes one of the dogs n. In the subsequent rotation of the drum it is drawn longitudinally on the shaft, with the result of moving the turret toward or from the work, as the case may be.

When the stock has been fed forward by the mechanism heretofore described, the end of said stock O strikes a stop Q21, which may be carried in one of the tool-sockets in the turret; or, rather, to be more exact in the manner of stating this operation, the stock is fed forward, and then, before the chuck is closed, the turret is fed toward the stock, the end of the stop in the turret striking the end of the stock, and, if necessary, pushing said stock backward and holdin g it against further outward movement until the chuck is closed.

To save as much time as possible, all the motions not used for cutting are performed considerably faster than those that are used for cutting. This alternate slow and fast motion is attained by the use of a trainvof gears and a silent feed so called. Mounted loosely upon the main driving-shaft, side by side, are two pulleys e7 es. The pulley es has rigidly connected with it a gear e9 and a pinion elo. Adjacent to these gears is a gear e, which is keyed or otherwise rigidly secured. to the main drivin g-shaft E. Keyed to the shaft K are the two gears 7c k7, which mesh, respectively, with the gears el0 en. For the fast motion of the driving-shaft and the various parts which are driven thereby the power is transmitted from the pulley es, through the gears el@ c k6 k7, to the driving-shaft E. For the slow motion the belt is shipped to the pulley e7.

The slow movement is secu red thro ugh what is known as the silent feed, which, in the novel form shown, is constructed, connected, and operated as follows:

IIO

R represents a disk formed upon or secured to a sleeve r, which is loosely mounted on the shaft K. A pinion r', rigid with said sleeve, meshes with the gear e9. Loosely mounted on the sleeve o, on opposite sides of the diskl .1"5, thereby causing disk R to move with it.

When either disk r3 r4 is rocked in the opposite direction, it moves alone, the rollers dropping back into the cam recesses. These disks r3 r4 act alternately in the manner described, the result being a slow, but practically continuous, movement of the disk R in one direction. The cam-shaped recesses and rollers constitute one form of a ratchet-clutch, and any other form of ratchet-clutch might be substituted. These two disks r3 r4 are rocked back and forth upon sleeve o by means of two links rs r9, which are pivoted on the same pin s to a lever S, said lever being pivoted to the frame of the machine. These two links are respectively connected at their other ends with crank-pins r1@ r11 on the disks T30. This lever S is operated by a ram-bar T, having a longitudinal slot z5, which embraces a fixed sleeve a8, which embraces the shaft E. A fixed pin a9 passes through a parallel slot t, and consequently the ram-bar is compelled to follow a path transverse to the axis of the shaft E, being guided therein by the said slots tt and the sleeve as and the pin a9. Projecting laterally from this ram-bar are two pins t2 and t3, bearing, respectively, the frictionrollers t4 t5, which rollers bear against the opposite edges of an eccentric disk Q, which is carried by the pulley c7. This disk causes the ram-bar to be moved longitudinally backward and forward, the length of this movement being proportionate to the'eccentricity of the said disk Q. This movement of the ram-bar operates the lever S, with the result of oscillating the disks r3 m4, and this movement of these disks produces, as before described, the slow, but practically continuous,

movement of the disk R in one direction. This movement of said disk is transmitted to the main drivin g-shaft through sleeve i", pinion i", gear e9, and the train of gears @1 c1175 T before described.

The eccentric disk Q is connected with the pulley c7, and its eccentricity is varied by the following construction and combination of parts: This pulley c7 has rigidly secured to or formed upon its outer side a disk cl2, to the side of which the eccentric disk Q is connected by means of the screws cl3, which project from disk @12 into two slot-s q in the eccentric disk on opposite sides of its center. This eccentric disk Q is held in the desired position relay lever Y.

tive to the shaft. and is moved to change its eccentricity by means of the following mechanism: A conical wedge V is slidable upon the shaft E within a tapered eccentric opening q in disk Q, the inner edges of this disk engagingavith said Wedge, as shown in Fig. 13. As shown in this figure, the disk is in its least eccentric position. The movement of said wedge V toward the pulley c7 moves the cam-disk to increase its eccentricity, while the subsequent reverse movement of said double wedge permits the opposite movement of said eccentric disk. This latter movement is effected positively by a reverse-cone o', integral with the cone V, which reverse-cone engages with a block q2, secured to the inner side of the eccentric disk Q.

In machines of this character the speed of the mechanism should vary as the work being done is heavy or light. The speed of the silent feed is, as before explained, proportionate to the eccentricity of the disk Q. The coneVis moved automatically at the proper times to change the eccentricity of this disk by means of a lever WV, which is pivoted to a fixed bracket a and bears against the end of the cone V, a rod w, which is pivotally connected with said lever W and is longitudinally movable in the frame, and the adjustable dog which is secured to a drum X on shaft E. This dog may be positioned so as to cause any desired movement of the lever XV and at any desired time, and it may be shaped to hold said lever in the position to which it is thereby moved for any period. There may be as many of these dogs as are necessary to effect the desired number of changes in speed.

The belt (not shown) for driving the pulleys e7 cs is automatically shipped from one pulley to the other by means of a belt-shipper This belt-shipper lever is moved by a lon gitudinally-movable bar y, having a slot y', which receives a pin y2 on said lever. This bar is moved in one direction by a spring ys, and it is moved in the opposite. direction by dogs fi, which are secured to a disk Ion the main shaft E. These dogs engage with a laterally-projecting arm fifi, which is secured to or formed integral with the bar y. The end of this arm with which the dogs first engage is beveled, as shown in Figs. 3 and I1,where by the engagement between the said dogs and face of this arm is effected. The inner edge of this arm, as shown in Fig. 1l, is eccentric to the path of the dog, being nearest at the end thereof with which the dog first contacts, and when the dogs leave contact with this bar they slide off of such inner edge. The dogs themselves are the round heads of radially-ad j ustable screws which screwinto the clamps i, which are fastened to the disk I. The farther the head of this screw is from the axis of the shaft the longer will the contact between it and the arm @/4 be maintained.

The cut-off slide P is mounted on the bedplate of the machine. A pinp projects from IOO IIC

one side of this slide and enters a cam-groove U' in the segment-shaped end of a rocker U, which is pivoted on the fixed stud cl2.

u represents a bell-crank lever pivoted on the same stud. In its approximately horizontal arm is a concentrically-curved slot u, into which projects a pin U2, which is rigid with the rocker U. Two adjustment-screws @L3 screw into this horizontal arm of the bellcrank lever, entering the ends of said curved slot on opposite sides of said pin U2. By the manipulation of these screws the position of` this pin within the slot may be adjusted. The approximately vertical arm of this bellcrank lever has a laterally-projecting pin at, which is adapted to be engaged by oppositelyinclined spiral cam-strips @14, which are secured upon the face of a drum @15, which is secured to the main driving-shaft E. These cam-strips, while spiral in form at one end, whereby the tool-slide may be moved, are straightat and near the other end, `whereby the tool-slide will be held for the proper length of time in the position to which it has been moved. Thedistance which the tool-slide shall travel may be shortened and otherwise changed by loosening one or the other of the ad justment-screws us, so that the bell-crank lever may have a `greater or less movement, before the ends of said screws engage with the pin and cause the segment-bar to move.

Z represents a handle which may be used for slowly moving the machine, and it is principally useful in setting the machine for a new job. This handle has a ring z', which embraces a disk e2, which is secured to the shaft K. In the face of this disk two camshaped notches ,c3 are cut, and in these notches lie the rollers 54. Collars z5, secured to this shaft, hold the ring in the described position and prevent the escape of the rollers. In the movement of the handle in one direction these rollers wedge themselves between the camfaces on the disk .c2 and the ring z', whereby the shaft is caused to turn. The handle is moved in the other direction without causing any motion of said shaft.

The construction described is generally a ratchet-clutch which connects t-he handle and the shaft. The specific form of this ratchet-clutch shown is not new, but it is believed that the combinatiomwith one of the shafts of a screw-machine, of an oscillating handle and a ratchet-clutch for connecting said shaft and handle is new.

Having described my invention, I claiml. In a screw-machine,in combination, the live-spindle, a pulley tight thereon, a pulley loose thereon, a gear tight to said loose pulley, a gear tight to the spindle, a rocker pivoted concentrically with said spindle, means for fixing its position, connected gears mounted on said rocker, and an idler-gear whereby motion is transmitted from one gear on the spindle to the other, and a belt-shipper, substantially as and for the purpose specified.

2. In a screw-machine, in combination, the live-spindle, a pulley loose thereon, a gear tight to said pulley, a gear tight to the spindle, a rocker hung upon said spindle, and means for securing it in fixed position, a shaft mounted thereon, two gears tightto said shaft, and an idler-gear, substantially as and for the purpose specified.

3. In a screw-machine, in combination, the live-spindle, a tight pulley thereon, a loose pulley thereon, means for transmitting motion from the loose pulley to the spindle, a belt-shipper lever having on one arm two cam'su rfaces, the driving-shaft, and two arms adjustably secured thereto for engagement with the said cam-surfaces, substantially as and for the purpose specified.

4. In ascreW-machine, the described means `for operating the cone which actuates the chuck, consisting of the following parts in combination, the fork-lever movable longitudinally with respect to the live-spindle, an operating-pin secured thereto, a three-arm lever having on the segment-shaped end of the work-arm spiral cams for engagement with said operating-pin, a rotating disk, and adjustable cams secured thereto, which engage with and alternately operate the two work-arms of said lever, substantially as and for the purpose specified.

5. In a screw-machine, in combination, the tubular live-spindle, tubular chuck, levers for operating the chuck, a cone for actuating said levers, a sliding sleeve having a fork for moving said cone and an operating-pin, a pivoted lever having two power-arms and a segment-shaped work-arm, cams upon the end of this work-arm for engagement with said operating-pin, and cams for engaging said power-arms alternately, substantially as and for the purpose specied.

6. In a screw-machine, the means substantially as described for moving the tool-slide, consisting of a segm ent-shaped rockerpivoted to a iixed stud, cams on its surface, a pin projecting from the tool-slide into engagement with said cams, an operating-lever pivoted on the same stud, rotating cams for engaging with one arm of said lever, and means for adjustably connecting said segment-shaped arm and the operating-lever, substantially as and for the purpose specified.

7. In a screw-machine, the means substantially as described for moving the tool-slide, consisting of a rocker having a segmentshaped end, cams thereon engaging a pin on the tool-slide, a bell-crank operating-lever having in one arm a curved slot, adjustmentscrews which enter the ends of this slot, a pin on the rocker which enters this slot between said screws, and rotating cams engaging with the other arm of the bell-crank lever, substantially as and for the purpose specified.

8. In a screw-machine, in combination, the turret-slide, a stud secured thereto, the main shaft, a secondary shaft, a suitable connecting mechanism, a drum longitudinally mov- IIO able upon said secondary shaft having cams on its surface, said drum also having a circumferential groove in which said stud engages, a longitudinal sliding bar having a projection which engages with saidsurface cams, and having also a stop-collar and a second projection, a drum secured to the main shaft, adjustable dogs thereon adapted to engage with the last-named projection on said bar, substantially as andfor the purpose specified. Y

9. In a screw-machine, in combination, the turret-slide, the main shaft, a secondary shaft driven therefrom, a disk secured to said secondary shaft, a drum loosely mounted on said shaft, pins parallel with the shaft secured to said disk passing loosely through holes in the hub of said drum, cams secured to the face of said drum, a sliding rod having. a projection adapted to engage with said cams, a stopcollar on said rod, a second projection on said rod, a drum secured to the main shaft, adjustable dogs secured to the surface of said drum, and a stud secured to the turret-slide entering a circumferential groove in the drum first named, substantially as and for the purpose specified.

10. In a screw-machine, in combination, the main shaft,two pulleys loosely mounted thereon, a secondary shaft, gears transmitting motion from one of said pulleys through the secondary shaft to the main shaft, a silent feed mounted on the secondary shaft, mechanism intermediate of the otherloose pulley and said silent feed, gears transmitting motion from said silent feed to the lirst-named loose pulley, substantially as and for the purpose specified.

11. In ascrew-m achine, in combination, the main shaft,two pulleys loosely mounted thereon, two gears fast to one of the said loose pulleys, a gear fast upon the main shaft, two gears fast on the secondary shaft in mesh, as described, whereby motion is transmitted from said loose pulley to the main shaft, a sleeve loose upon the secondary shaft, a gear fast thereto in mesh with one of the gears secured to said loose pulley, a silent feed on said sleeve, and mechanism intermediate of the other loose pulley and silent feed, substantially as and for the purpose specified.

12. Inascrew-machine, in combination, the main shaft, a pulley loosely mounted thereon, an eccentric disk rotating with said pulley, a ram-bar operated by said eccentric disk, a lever operated by said ram-bar, a secondary shaft, a silent feed mounted thereon, mechanism intermediate of said lever and silent feed whereby the latter is operated, and a -train of gears transmitting motion from said silent feed to the main shaft, substantially as and for the purpose specified.

13. In a screw-machine,in combination, the main shaft, a pulley loosely mounted thereon, aneccentric disk rotating with said pulley, means for varying the eccentricity of said disk, a ram-bar engaging said disk, a lever operated by said ram-bar, a silent feed operated by said lever, and a train of gears transmitting motion from said silent feed to the main shaft, substantially as and for the purpose specified.

14. Inascrew-machine, in combination, the main shaft, apulleyloosely mounted thereon, a transversely-movable eccentric disk connected with said pulley and having an eccentric hole, a cone longitudinally movable upon the main shaft within the disk and in engagement therewith, mechanism operated by said eccentric disk whereby the main shaft is rotated, a lever for moving said cone, and adjustable cams for operating said lever, substantially as and for the purpose specified.

15. In a screw-machine, in combination, the main shaft, a pulley loosely mounted thereon, an eccentric disk rotating with the pulley, a ram-bar operated by said disk, a lever operated by said ram-bar, a sleeve mounted on the secondary shaft, a disk rotating with said Sleeve, mechanism for transmitting motion from the sleeve to the main shaft, two oscillating disks mounted axially with respect to said sleeve, clutching devices for alternately connecting said two disks with the disk which is fast to said sleeve, and two links respectively connecting these two disks with said lever, substantially as and for the purpose specified.

16. In a screw-machine, in combination, the main shaft,two pulleys loosely mounted thereon, mechanisms for transmitting motion at IOO different speeds from said pulleys respectively to the shaft, a belt-shipper lever, a longitudinally-movable bar for operating said lever, a spring for moving saidbar in one direction, a rotating disk, dogs adjustably secured thereon, and a plate having a beveled end secured to said bar, substantially as and for the purpose specified.

17. In a screw-machine, in combination, a

belt-shipper lever, a longitudinally-movable bar, a spring, an eccentrically-curved plate on the end of said bar, a rotating disk, radially-adjustable dogs secured thereto for engagement with said plate, substantially as and for the purpose specified. Y

18. In a screw-machine, in combination, the turret-slide,the turret-spindle mounted therein, and a ratchet secured to said turret-spindle with an oscillating sleeve mounted in the fixed support concentric with said turretspindle, a pawl carried thereby, a connecting-rod pivoted on a crank-pin secured to said sleeve, a pivoted lever to which the other end of said connecting-rod is pivoted, a rotating disk', and cams secured thereto for operating said' lever, substantially as and for the purpose specified.

In testimony whereof I affix my signature in presence of two witnesses.

FREDERICK SCHULZE.

Witnesses:

E. L. THURsToN, LEON F. SCHULZE. 

